ustd/ustd.c

   1 /* Copyright (C) 2009  Pierre-Marc Fournier
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  16  */
  17
  18 #define _GNU_SOURCE
  19
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <sys/shm.h>
  23 #include <fcntl.h>
  24 #include <unistd.h>
  25 #include <pthread.h>
  26 #include <signal.h>
  27
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <errno.h>
  32 #include <assert.h>
  33 #include <getopt.h>
  34
  35 #include "ustd.h"
  36 #include "usterr.h"
  37 #include "ustcomm.h"
  38
  39 /* return value: 0 = subbuffer is finished, it won't produce data anymore
  40  *               1 = got subbuffer successfully
  41  *               <0 = error
  42  */
  43
  44 #define GET_SUBBUF_OK 1
  45 #define GET_SUBBUF_DONE 0
  46 #define GET_SUBBUF_DIED 2
  47
  48 #define PUT_SUBBUF_OK 1
  49 #define PUT_SUBBUF_DIED 0
  50 #define PUT_SUBBUF_PUSHED 2
  51 #define PUT_SUBBUF_DONE 3
  52
  53 char *sock_path=NULL;
  54 char *trace_path=NULL;
  55 int daemon_mode = 0;
  56 char *pidfile = NULL;
  57
  58 /* Number of active buffers and the mutex to protect it. */
  59 int active_buffers = 0;
  60 pthread_mutex_t active_buffers_mutex = PTHREAD_MUTEX_INITIALIZER;
  61 /* Whether a request to end the program was received. */
  62 sig_atomic_t terminate_req = 0;
  63
  64 int get_subbuffer(struct buffer_info *buf)
  65 {
  66         char *send_msg=NULL;
  67         char *received_msg=NULL;
  68         char *rep_code=NULL;
  69         int retval;
  70         int result;
  71
  72         asprintf(&send_msg, "get_subbuffer %s", buf->name);
  73         result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
  74         if((result == -1 && errno == EPIPE) || result == 0) {
  75                 DBG("app died while being traced");
  76                 retval = GET_SUBBUF_DIED;
  77                 goto end;
  78         }
  79         else if(result < 0) {
  80                 ERR("get_subbuffer: ustcomm_send_request failed");
  81                 retval = -1;
  82                 goto end;
  83         }
  84
  85         result = sscanf(received_msg, "%as %ld", &rep_code, &buf->consumed_old);
  86         if(result != 2 && result != 1) {
  87                 ERR("unable to parse response to get_subbuffer");
  88                 retval = -1;
  89                 goto end_rep;
  90         }
  91
  92         DBG("received msg is %s", received_msg);
  93
  94         if(!strcmp(rep_code, "OK")) {
  95                 DBG("got subbuffer %s", buf->name);
  96                 retval = GET_SUBBUF_OK;
  97         }
  98         else if(nth_token_is(received_msg, "END", 0) == 1) {
  99                 retval = GET_SUBBUF_DONE;
 100                 goto end_rep;
 101         }
 102         else if(!strcmp(received_msg, "NOTFOUND")) {
 103                 WARN("For buffer %s, the trace was not found. This likely means it was destroyed by the user.", buf->name);
 104                 retval = GET_SUBBUF_DONE;
 105                 goto end_rep;
 106         }
 107         else {
 108                 DBG("error getting subbuffer %s", buf->name);
 109                 retval = -1;
 110         }
 111
 112         /* FIMXE: free correctly the stuff */
 113 end_rep:
 114         if(rep_code)
 115                 free(rep_code);
 116 end:
 117         if(send_msg)
 118                 free(send_msg);
 119         if(received_msg)
 120                 free(received_msg);
 121
 122         return retval;
 123 }
 124
 125 int put_subbuffer(struct buffer_info *buf)
 126 {
 127         char *send_msg=NULL;
 128         char *received_msg=NULL;
 129         char *rep_code=NULL;
 130         int retval;
 131         int result;
 132
 133         asprintf(&send_msg, "put_subbuffer %s %ld", buf->name, buf->consumed_old);
 134         result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
 135         if(result < 0 && errno == ECONNRESET) {
 136                 retval = PUT_SUBBUF_DIED;
 137                 goto end;
 138         }
 139         else if(result < 0) {
 140                 ERR("put_subbuffer: send_message failed");
 141                 retval = -1;
 142                 goto end;
 143         }
 144         else if(result == 0) {
 145                 /* Program seems finished. However this might not be
 146                  * the last subbuffer that has to be collected.
 147                  */
 148                 retval = PUT_SUBBUF_DIED;
 149                 goto end;
 150         }
 151
 152         result = sscanf(received_msg, "%as", &rep_code);
 153         if(result != 1) {
 154                 ERR("unable to parse response to put_subbuffer");
 155                 retval = -1;
 156                 goto end_rep;
 157         }
 158
 159         if(!strcmp(rep_code, "OK")) {
 160                 DBG("subbuffer put %s", buf->name);
 161                 retval = PUT_SUBBUF_OK;
 162         }
 163         else if(!strcmp(received_msg, "NOTFOUND")) {
 164                 WARN("For buffer %s, the trace was not found. This likely means it was destroyed by the user.", buf->name);
 165                 /* However, maybe this was not the last subbuffer. So
 166                  * we return the program died.
 167                  */
 168                 retval = PUT_SUBBUF_DIED;
 169                 goto end_rep;
 170         }
 171         else {
 172                 DBG("put_subbuffer: received error, we were pushed");
 173                 retval = PUT_SUBBUF_PUSHED;
 174                 goto end_rep;
 175         }
 176
 177 end_rep:
 178         if(rep_code)
 179                 free(rep_code);
 180
 181 end:
 182         if(send_msg)
 183                 free(send_msg);
 184         if(received_msg)
 185                 free(received_msg);
 186
 187         return retval;
 188 }
 189
 190 void decrement_active_buffers(void *arg)
 191 {
 192         pthread_mutex_lock(&active_buffers_mutex);
 193         active_buffers--;
 194         pthread_mutex_unlock(&active_buffers_mutex);
 195 }
 196
 197 int create_dir_if_needed(char *dir)
 198 {
 199         int result;
 200         result = mkdir(dir, 0777);
 201         if(result == -1) {
 202                 if(errno != EEXIST) {
 203                         PERROR("mkdir");
 204                         return -1;
 205                 }
 206         }
 207
 208         return 0;
 209 }
 210
 211 int is_directory(const char *dir)
 212 {
 213         int result;
 214         struct stat st;
 215
 216         result = stat(dir, &st);
 217         if(result == -1) {
 218                 PERROR("stat");
 219                 return 0;
 220         }
 221
 222         if(!S_ISDIR(st.st_mode)) {
 223                 return 0;
 224         }
 225
 226         return 1;
 227 }
 228
 229 struct buffer_info *connect_buffer(pid_t pid, const char *bufname)
 230 {
 231         struct buffer_info *buf;
 232         char *send_msg;
 233         char *received_msg;
 234         int result;
 235         char *tmp;
 236         int fd;
 237         struct shmid_ds shmds;
 238
 239         buf = (struct buffer_info *) malloc(sizeof(struct buffer_info));
 240         if(buf == NULL) {
 241                 ERR("add_buffer: insufficient memory");
 242                 return NULL;
 243         }
 244
 245         buf->name = bufname;
 246         buf->pid = pid;
 247
 248         /* connect to app */
 249         result = ustcomm_connect_app(buf->pid, &buf->conn);
 250         if(result) {
 251                 WARN("unable to connect to process, it probably died before we were able to connect");
 252                 return NULL;
 253         }
 254
 255         /* get pidunique */
 256         asprintf(&send_msg, "get_pidunique");
 257         result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
 258         free(send_msg);
 259         if(result == -1) {
 260                 ERR("problem in ustcomm_send_request(get_pidunique)");
 261                 return NULL;
 262         }
 263
 264         result = sscanf(received_msg, "%lld", &buf->pidunique);
 265         if(result != 1) {
 266                 ERR("unable to parse response to get_pidunique");
 267                 return NULL;
 268         }
 269         free(received_msg);
 270         DBG("got pidunique %lld", buf->pidunique);
 271
 272         /* get shmid */
 273         asprintf(&send_msg, "get_shmid %s", buf->name);
 274         result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
 275         free(send_msg);
 276         if(result == -1) {
 277                 ERR("problem in ustcomm_send_request(get_shmid)");
 278                 return NULL;
 279         }
 280
 281         result = sscanf(received_msg, "%d %d", &buf->shmid, &buf->bufstruct_shmid);
 282         if(result != 2) {
 283                 ERR("unable to parse response to get_shmid (\"%s\")", received_msg);
 284                 return NULL;
 285         }
 286         free(received_msg);
 287         DBG("got shmids %d %d", buf->shmid, buf->bufstruct_shmid);
 288
 289         /* get n_subbufs */
 290         asprintf(&send_msg, "get_n_subbufs %s", buf->name);
 291         result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
 292         free(send_msg);
 293         if(result == -1) {
 294                 ERR("problem in ustcomm_send_request(g_n_subbufs)");
 295                 return NULL;
 296         }
 297
 298         result = sscanf(received_msg, "%d", &buf->n_subbufs);
 299         if(result != 1) {
 300                 ERR("unable to parse response to get_n_subbufs");
 301                 return NULL;
 302         }
 303         free(received_msg);
 304         DBG("got n_subbufs %d", buf->n_subbufs);
 305
 306         /* get subbuf size */
 307         asprintf(&send_msg, "get_subbuf_size %s", buf->name);
 308         ustcomm_send_request(&buf->conn, send_msg, &received_msg);
 309         free(send_msg);
 310
 311         result = sscanf(received_msg, "%d", &buf->subbuf_size);
 312         if(result != 1) {
 313                 ERR("unable to parse response to get_subbuf_size");
 314                 return NULL;
 315         }
 316         free(received_msg);
 317         DBG("got subbuf_size %d", buf->subbuf_size);
 318
 319         /* attach memory */
 320         buf->mem = shmat(buf->shmid, NULL, 0);
 321         if(buf->mem == (void *) 0) {
 322                 PERROR("shmat");
 323                 return NULL;
 324         }
 325         DBG("successfully attached buffer memory");
 326
 327         buf->bufstruct_mem = shmat(buf->bufstruct_shmid, NULL, 0);
 328         if(buf->bufstruct_mem == (void *) 0) {
 329                 PERROR("shmat");
 330                 return NULL;
 331         }
 332         DBG("successfully attached buffer bufstruct memory");
 333
 334         /* obtain info on the memory segment */
 335         result = shmctl(buf->shmid, IPC_STAT, &shmds);
 336         if(result == -1) {
 337                 PERROR("shmctl");
 338                 return NULL;
 339         }
 340         buf->memlen = shmds.shm_segsz;
 341
 342         /* open file for output */
 343         if(!trace_path) {
 344                 /* Only create the directory if using the default path, because
 345                  * of the risk of typo when using trace path override. We don't
 346                  * want to risk creating plenty of useless directories in that case.
 347                  */
 348                 result = create_dir_if_needed(USTD_DEFAULT_TRACE_PATH);
 349                 if(result == -1) {
 350                         ERR("could not create directory %s", USTD_DEFAULT_TRACE_PATH);
 351                         return NULL;
 352                 }
 353
 354                 trace_path = USTD_DEFAULT_TRACE_PATH;
 355         }
 356
 357         asprintf(&tmp, "%s/%u_%lld", trace_path, buf->pid, buf->pidunique);
 358         result = create_dir_if_needed(tmp);
 359         if(result == -1) {
 360                 ERR("could not create directory %s", tmp);
 361                 free(tmp);
 362                 return NULL;
 363         }
 364         free(tmp);
 365
 366         asprintf(&tmp, "%s/%u_%lld/%s", trace_path, buf->pid, buf->pidunique, buf->name);
 367         result = fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 00600);
 368         if(result == -1) {
 369                 PERROR("open");
 370                 ERR("failed opening trace file %s", tmp);
 371                 return NULL;
 372         }
 373         buf->file_fd = fd;
 374         free(tmp);
 375
 376         pthread_mutex_lock(&active_buffers_mutex);
 377         active_buffers++;
 378         pthread_mutex_unlock(&active_buffers_mutex);
 379
 380         return buf;
 381 }
 382
 383 int write_current_subbuffer(struct buffer_info *buf)
 384 {
 385         int result;
 386
 387         void *subbuf_mem = buf->mem + (buf->consumed_old & (buf->n_subbufs * buf->subbuf_size-1));
 388
 389         size_t cur_sb_size = subbuffer_data_size(subbuf_mem);
 390
 391         result = patient_write(buf->file_fd, subbuf_mem, cur_sb_size);
 392         if(result == -1) {
 393                 PERROR("write");
 394                 /* FIXME: maybe drop this trace */
 395                 return 0;
 396         }
 397
 398         return 0;
 399 }
 400
 401 int consumer_loop(struct buffer_info *buf)
 402 {
 403         int result;
 404
 405         pthread_cleanup_push(decrement_active_buffers, NULL);
 406
 407         for(;;) {
 408                 /* get the subbuffer */
 409                 result = get_subbuffer(buf);
 410                 if(result == -1) {
 411                         ERR("error getting subbuffer");
 412                         continue;
 413                 }
 414                 else if(result == GET_SUBBUF_DONE) {
 415                         /* this is done */
 416                         break;
 417                 }
 418                 else if(result == GET_SUBBUF_DIED) {
 419                         finish_consuming_dead_subbuffer(buf);
 420                         break;
 421                 }
 422
 423                 /* write data to file */
 424                 write_current_subbuffer(buf);
 425                 /* FIXME: handle return value? */
 426
 427                 /* put the subbuffer */
 428                 /* FIXME: we actually should unput the buffer before consuming... */
 429                 result = put_subbuffer(buf);
 430                 if(result == -1) {
 431                         ERR("unknown error putting subbuffer (channel=%s)", buf->name);
 432                         break;
 433                 }
 434                 else if(result == PUT_SUBBUF_PUSHED) {
 435                         ERR("Buffer overflow (channel=%s), reader pushed. This channel will not be usable passed this point.", buf->name);
 436                         break;
 437                 }
 438                 else if(result == PUT_SUBBUF_DIED) {
 439                         WARN("application died while putting subbuffer");
 440                         /* FIXME: probably need to skip the first subbuffer in finish_consuming_dead_subbuffer */
 441                         finish_consuming_dead_subbuffer(buf);
 442                         break;
 443                 }
 444                 else if(result == PUT_SUBBUF_DONE) {
 445                         /* Done with this subbuffer */
 446                         /* FIXME: add a case where this branch is used? Upon
 447                          * normal trace termination, at put_subbuf time, a
 448                          * special last-subbuffer code could be returned by
 449                          * the listener.
 450                          */
 451                         break;
 452                 }
 453                 else if(result == PUT_SUBBUF_OK) {
 454                 }
 455         }
 456
 457         DBG("thread for buffer %s is stopping", buf->name);
 458
 459         /* FIXME: destroy, unalloc... */
 460
 461         pthread_cleanup_pop(1);
 462
 463         return 0;
 464 }
 465
 466 void free_buffer(struct buffer_info *buf)
 467 {
 468 }
 469
 470 struct consumer_thread_args {
 471         pid_t pid;
 472         const char *bufname;
 473 };
 474
 475 void *consumer_thread(void *arg)
 476 {
 477         struct buffer_info *buf = (struct buffer_info *) arg;
 478         struct consumer_thread_args *args = (struct consumer_thread_args *) arg;
 479
 480         DBG("GOT ARGS: pid %d bufname %s", args->pid, args->bufname);
 481
 482         buf = connect_buffer(args->pid, args->bufname);
 483         if(buf == NULL) {
 484                 ERR("failed to connect to buffer");
 485                 goto end;
 486         }
 487
 488         consumer_loop(buf);
 489
 490         free_buffer(buf);
 491
 492         end:
 493         /* bufname is free'd in free_buffer() */
 494         free(args);
 495         return NULL;
 496 }
 497
 498 int start_consuming_buffer(pid_t pid, const char *bufname)
 499 {
 500         pthread_t thr;
 501         struct consumer_thread_args *args;
 502
 503         DBG("beginning of start_consuming_buffer: args: pid %d bufname %s", pid, bufname);
 504
 505         args = (struct consumer_thread_args *) malloc(sizeof(struct consumer_thread_args));
 506
 507         args->pid = pid;
 508         args->bufname = strdup(bufname);
 509         DBG("beginning2 of start_consuming_buffer: args: pid %d bufname %s", args->pid, args->bufname);
 510
 511         pthread_create(&thr, NULL, consumer_thread, args);
 512         DBG("end of start_consuming_buffer: args: pid %d bufname %s", args->pid, args->bufname);
 513
 514         return 0;
 515 }
 516
 517 void usage(void)
 518 {
 519         fprintf(stderr, "Usage:\nustd OPTIONS\n\nOptions:\n"
 520                         "\t-h\t\tDisplay this usage.\n"
 521                         "\t-o DIR\t\tSpecify the directory where to output the traces.\n"
 522                         "\t-s PATH\t\tSpecify the path to use for the daemon socket.\n"
 523                         "\t-d\t\tStart as a daemon.\n"
 524                         "\t--pidfile FILE\tWrite the PID in this file (when using -d).\n");
 525 }
 526
 527 int parse_args(int argc, char **argv)
 528 {
 529         int c;
 530
 531         while (1) {
 532                 int option_index = 0;
 533                 static struct option long_options[] = {
 534                         {"pidfile", 1, 0, 'p'},
 535                         {"help", 0, 0, 'h'},
 536                         {"version", 0, 0, 'V'},
 537                         {0, 0, 0, 0}
 538                 };
 539
 540                 c = getopt_long(argc, argv, "hs:o:d", long_options, &option_index);
 541                 if (c == -1)
 542                         break;
 543
 544                 switch (c) {
 545                 case 0:
 546                         printf("option %s", long_options[option_index].name);
 547                         if (optarg)
 548                                 printf(" with arg %s", optarg);
 549                         printf("\n");
 550                         break;
 551                 case 's':
 552                         sock_path = optarg;
 553                         break;
 554                 case 'o':
 555                         trace_path = optarg;
 556                         if(!is_directory(trace_path)) {
 557                                 ERR("Not a valid directory. (%s)", trace_path);
 558                                 return -1;
 559                         }
 560                         break;
 561                 case 'd':
 562                         daemon_mode = 1;
 563                         break;
 564                 case 'p':
 565                         pidfile = strdup(optarg);
 566                         break;
 567                 case 'h':
 568                         usage();
 569                         exit(0);
 570                 case 'V':
 571                         printf("Version 0.0\n");
 572                         break;
 573
 574                 default:
 575                         /* unknown option or other error; error is
 576                         printed by getopt, just return */
 577                         return -1;
 578                 }
 579         }
 580
 581         return 0;
 582 }
 583
 584 void sigterm_handler(int sig)
 585 {
 586         terminate_req = 1;
 587 }
 588
 589 static int write_pidfile(const char *file_name, pid_t pid)
 590 {
 591         FILE *pidfp;
 592
 593         pidfp = fopen(file_name, "w");
 594         if(!pidfp) {
 595                 PERROR("fopen (%s)", pidfile);
 596                 WARN("killing child process");
 597                 return -1;
 598         }
 599
 600         fprintf(pidfp, "%d\n", pid);
 601
 602         fclose(pidfp);
 603
 604         return 0;
 605 }
 606
 607 int start_ustd(int fd)
 608 {
 609         struct ustcomm_ustd ustd;
 610         int result;
 611         sigset_t sigset;
 612         struct sigaction sa;
 613
 614         result = sigemptyset(&sigset);
 615         if(result == -1) {
 616                 PERROR("sigemptyset");
 617                 return 1;
 618         }
 619         sa.sa_handler = sigterm_handler;
 620         sa.sa_mask = sigset;
 621         sa.sa_flags = SA_RESTART;
 622         result = sigaction(SIGTERM, &sa, NULL);
 623         if(result == -1) {
 624                 PERROR("sigaction");
 625                 return 1;
 626         }
 627
 628         result = ustcomm_init_ustd(&ustd, sock_path);
 629         if(result == -1) {
 630                 ERR("failed to initialize socket");
 631                 return 1;
 632         }
 633
 634         /* setup handler for SIGPIPE */
 635         result = sigemptyset(&sigset);
 636         if(result == -1) {
 637                 PERROR("sigemptyset");
 638                 return 1;
 639         }
 640         result = sigaddset(&sigset, SIGPIPE);
 641         if(result == -1) {
 642                 PERROR("sigaddset");
 643                 return 1;
 644         }
 645         result = sigprocmask(SIG_BLOCK, &sigset, NULL);
 646         if(result == -1) {
 647                 PERROR("sigprocmask");
 648                 return 1;
 649         }
 650
 651         /* Write pidfile */
 652         if(pidfile) {
 653                 result = write_pidfile(pidfile, getpid());
 654                 if(result == -1) {
 655                         ERR("failed to write pidfile");
 656                         return 1;
 657                 }
 658         }
 659
 660         /* Notify parent that we are successfully started. */
 661         if(fd != -1) {
 662                 /* write any one character */
 663                 result = write(fd, "!", 1);
 664                 if(result == -1) {
 665                         PERROR("write");
 666                         return -1;
 667                 }
 668                 if(result != 1) {
 669                         ERR("Problem sending confirmation of daemon start to parent");
 670                         return -1;
 671                 }
 672                 result = close(fd);
 673                 if(result == -1) {
 674                         PERROR("close");
 675                 }
 676         }
 677
 678         /* app loop */
 679         for(;;) {
 680                 char *recvbuf;
 681
 682                 /* check for requests on our public socket */
 683                 result = ustcomm_ustd_recv_message(&ustd, &recvbuf, NULL, 100);
 684                 if(result == -1) {
 685                         ERR("error in ustcomm_ustd_recv_message");
 686                         goto loop_end;
 687                 }
 688                 if(result > 0) {
 689                         if(!strncmp(recvbuf, "collect", 7)) {
 690                                 pid_t pid;
 691                                 char *bufname;
 692                                 int result;
 693
 694                                 result = sscanf(recvbuf, "%*s %d %50as", &pid, &bufname);
 695                                 if(result != 2) {
 696                                         ERR("parsing error: %s", recvbuf);
 697                                         goto free_bufname;
 698                                 }
 699
 700                                 result = start_consuming_buffer(pid, bufname);
 701                                 if(result < 0) {
 702                                         ERR("error in add_buffer");
 703                                         goto free_bufname;
 704                                 }
 705
 706                                 free_bufname:
 707                                 free(bufname);
 708                         }
 709
 710                         free(recvbuf);
 711                 }
 712
 713                 loop_end:
 714
 715                 if(terminate_req) {
 716                         pthread_mutex_lock(&active_buffers_mutex);
 717                         if(active_buffers == 0) {
 718                                 pthread_mutex_unlock(&active_buffers_mutex);
 719                                 break;
 720                         }
 721                         pthread_mutex_unlock(&active_buffers_mutex);
 722                 }
 723         }
 724
 725         return 0;
 726 }
 727
 728 int start_ustd_daemon()
 729 {
 730         int result;
 731         int fd[2];
 732         pid_t child_pid;
 733
 734         result = pipe(fd);
 735
 736         result = child_pid = fork();
 737         if(result == -1) {
 738                 PERROR("fork");
 739                 return -1;
 740         }
 741         else if(result == 0) {
 742                 return start_ustd(fd[1]);
 743         }
 744         else {
 745                 char buf;
 746
 747                 result = read(fd[0], &buf, 1);
 748                 if(result == -1) {
 749                         PERROR("read");
 750                         return -1;
 751                 }
 752                 if(result != 1) {
 753                         ERR("did not receive valid confirmation that the daemon is started");
 754                         return -1;
 755                 }
 756
 757                 result = close(fd[0]);
 758                 if(result == -1) {
 759                         PERROR("close");
 760                 }
 761
 762                 DBG("The daemon is now successfully started");
 763         }
 764
 765         /* Wait for confirmation that the server is ready. */
 766
 767
 768         return 0;
 769 }
 770
 771 int main(int argc, char **argv)
 772 {
 773         int result;
 774
 775         result = parse_args(argc, argv);
 776         if(result == -1) {
 777                 exit(1);
 778         }
 779
 780         if(daemon_mode) {
 781                 result = start_ustd_daemon();
 782         }
 783         else {
 784                 result = start_ustd(-1);
 785         }
 786
 787         return result;
 788 }